1553920 has 40 divisors (see below), whose sum is σ = 3731904. Its totient is φ = 620544.

The previous prime is 1553897. The next prime is 1553927. The reversal of 1553920 is 293551.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2257 + ... + 2863.

2^1553920 is an apocalyptic number.

1553920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1553920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1865952).

1553920 is an abundant number, since it is smaller than the sum of its proper divisors (2177984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1553920 is an frugal number, since it uses more digits than its factorization.

1553920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1553920 is about 1246.5632755701. The cubic root of 1553920 is about 115.8269317696.

It can be divided in two parts, 15 and 53920, that added together give a palindrome (53935).

The spelling of 1553920 in words is "one million, five hundred fifty-three thousand, nine hundred twenty".